Process of neutralizing static electricity.



No. 844,300. PATENTED FEB. 12, 1907. W. H. CHAPMAN. PROCESS OFNEUTRALIZING STATIC ELECTRICITY.

APPLICATION FILED FEB.12,1906.

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UNITED srarnsrarnsr QFFICE.

WILLIAM H. CHAPMAN, OF PORTLAND, MAINE, ASSIGNUR T0 CHAPMAN ELECTRICNEUTRALIZER COMPANY, OF PORTLAND, MAINE, A (301% IUItATION OF MAINE.

PROCESS OF NEUTFi/tLiZtNQ-Z S'llfii'i'l@ ELECTRIQITY.

Specification of Letters Patent.

Patented Feb. 1.2, 1907.

Application filed February 12, 1906, Serial No. 300,604.

MAN, a citizen of the United States ol" America, and a resident ofPortland, Maine,

provenients in Process of Neutralizing Static Electricity, of which thefollowing is a speci iication.

My present inventionrelates to a process ol removing static electricityfrom roving or g i l I yarn in textile work and from other articleswhere, as a matter ol convenience or ne-,

cessity, the apparatus must be located at a more or less remote distancefrom the WOili.

My method consists in placing charged electric conductors at someavailable point near the material to be treated; but it may be fartheraway than the charges could of themselves alone have any influence onthe material, and then by suitable means creating a current of air whichshall pass around or over the conductor and which shall carry the chargeacross the intervening space, and thus neutralize the static charge inthe material subject to the process. For instance, in the process ofmanufacturing mohair into yarn there is much trouble in the combing-machines and drawing-frames and spinningfraines caused by the materialbeing charged by compression between the rollers, and as the compressionis repeated many times in various parts of the machine and as eachmachine is already crowded with the coin stituent parts of the machineitself, leaving no available room, for additional parts, it becomesimportant to place the neutralizing apparatus outside of the machine as,for instance, overhead on the ceilingol the rooin-- and to provide forconveying the neutralizing charges to the material in all parts of themachine at the same time. 7

A simple means of carrying out my proeess is shown in the accompanyingdrawing, in which A is a rotary blower, B is a network of electricconductors kept charged through wire (I, and (l is the roving of mohairor other material passing through the rollers e 01 a drawing-heme,whereby it is continually being charged.

The network of the Wires B may be kept charged by any suitablemeans--as, for in stance, by a Wimshurst machine D or by an.

I nicnt.

ol' the air supplied or ol the voltage ol the no alternator-giving highvoltage and having its charges partially or wholly coinniutated,

so as to givethe wires a charge which, for the most or the whole of thetime, is of a polarity have invented certain new and usclul lnioppositeto that ol' the material under treat,-

A proper regulation ol the quantity electric charge, or both, thenenables us to secure perfect neutralization.

l hint that in carrying my process into prac tical use I get goodresults ll'Olii an alternat ing current ol unequal pulsations, the long5 pulsation being of opposite polarity to the charge in the mohair or other body, while the short pulsation is of Lkc polarity; l have used lorthe purpose an alternation in hich the prevailingpolarity was threetimes thatol' the lesser. liy thus producing a charge in which theprcponderating kind ol' electricity is so far in excess ol" the lesserkind the charge can be conveyed considerable t ist ances by the use ofthe air-current, and it does not require the accurate regulations whichis necessary when the charge is all of one polarity.

In order to carry the charges from the conductor to the article to beiientralizml, it is may be varied indefinitely, any other suitabledevices being used. For instance, the conductor may have a series olpoints l'i'oni which the electrical charges may escape into the air, andmany forms may be devised l'or this purpose.

I'lind thatitisiinportant to use a conductor which will admit theair-current passing over and around it coming into coi-itact with itsexternal surface like the wire-netting above described, since it. is awell-known law oi electricity that air can only become electriiied bycoming in contact with the external surl'ace oi conductors, theelectricity being concentrated at that portion ol' the conductor.

I elaiinl. The process ol neutralizing static electricity in a bodyconsisting of blowing a current of air against said body and placing insaid air-current before it reaches said bony a opposite polarity to thatcontained in the blowing a current of air against said body body.

2. The process of neutralizing static charges of electricity in a bodyconsisting of 5 blowing a current of air against said body and placingin said air-current a conductor having applied to it an alternatingcharge of electricity.

3. The process of neutralizing static [o charges of electricity in abody consisting of and placing in said air-current a conductor having analternating charge of electricity with a series of relatively long andshort inipulses of which the long iin )ulsos have a polarity opposite tothat of t 1e charged body.

WILLIAM H. CHAPMAN. Witnesses:

S. W. BATES, MARY A. DONALDSON.

